unilateralism
US /ˌjuː.nəˈlæt̬.ɚ.əl.ɪ.zəm/
UK /ˌjuː.nəˈlæt̬.ɚ.əl.ɪ.zəm/

1.
unilateralismo
the doctrine or practice of advocating or pursuing a single-sided, independent course of action in foreign affairs, without the agreement or support of other countries or international organizations
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The country's decision to act alone was seen as an example of unilateralism.
La decisione del paese di agire da solo è stata vista come un esempio di unilateralismo.
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Critics argue that unilateralism can lead to international isolation.
I critici sostengono che l'unilateralismo può portare all'isolamento internazionale.